post your worst idea thread

While starting on a camshaft change in my 340 Dart Swinger back in the early 70s, my buddy and I were unable to break the crankshaft bolt free to remove the harmonic balancer. We just couldn't figure out how to keep the crank from spinning so we could break the bolt free.
A collective bright idea led us to jam a spare wrench between an upcoming cam lobe and the block.
Hey, if the cam lobe gets damaged it's no big deal because we're going to put in a new cam anyway.
So, wrench installed so cam won't turn and it's holding the crank still too. Outstanding!
Now both of us are under the car with a cheater extension on the ratchet and socket that's on the crank bolt. Start to really put some effort in to break that bolt loose and...

What was that noise and where did it come from?

Broke the block right through the wall of a lifter bore.

Now we can't install the new cam until I go out and buy a new block. Yeah, that was a great idea...